chore: Switch test workflows to ubicloud runners (#2078)

#### Summary

Uses ubicloud runners which are 10x cheaper for testing workflows.
Publishing related workflows will still use GitHub runners for security reasons

---

.github/workflows/lint_golang.yml

@@ -10,7 +10,7 @@ on:
 jobs:
   golangci:
     name: Lint with GolangCI
-    runs-on: large-ubuntu-plugin-sdk
+    runs-on: ubicloud-standard-8
     timeout-minutes: 10
     steps:
       - uses: actions/checkout@v4

.github/workflows/unittest.yml

@@ -11,7 +11,7 @@ jobs:
   unitests:
     strategy:
       matrix:
-        os: [large-ubuntu-plugin-sdk, large-windows-plugin-sdk, macos-latest]
+        os: [ubicloud-standard-8, large-windows-plugin-sdk, macos-latest]
     runs-on: ${{ matrix.os }}
     timeout-minutes: 15
     steps:
@@ -26,13 +26,13 @@ jobs:
       - name: Run tests
         run: make test
       - name: Run benchmark
-        if: matrix.os == 'large-ubuntu-plugin-sdk'
+        if: matrix.os == 'ubicloud-standard-8'
         run: make benchmark-ci
       - name: Save PR number
-        if: matrix.os == 'large-ubuntu-plugin-sdk' && github.event_name == 'pull_request'
+        if: matrix.os == 'ubicloud-standard-8' && github.event_name == 'pull_request'
         run: echo ${{ github.event.number }} > ./pr_number
       - name: Upload deltas
-        if: matrix.os == 'large-ubuntu-plugin-sdk'
+        if: matrix.os == 'ubicloud-standard-8'
         uses: actions/upload-artifact@v4
         with:
           name: delta-action-benchmarks